Atmel ATA6870锂离子电池组监测方案
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Atmel 公司的ATA6870是锂离子和NiMH多个电池组测量和监测电路，它采用12位ADC来监测电池电压和电池温度，还提供每个电池平衡充电能力。此外还集成线性稳压器，以便给MCU或外接元件供电。可处理多达16个电路（96个电池）的监测。主要用在电动汽车和混合动力汽车。本文介绍ATA6870主要特性，方框图，应用电路以及用来管理锂离子/NiMH电池的评估板方框图和电路图。
The ATA6870 is a measurement and monitoring circuit designed for Li-ion and NiMH multicell battery stacks in hybrid electrical vehicles.
The ATA6870 monitors the battery-cell voltage and the battery-cell temperature with a 12-bit ADC.
The circuit also provides charge-balancing capability for each battery-cell. In addition, a linear regulator is integrated to supply a microcontroller or other external components. Reliable communication between stacked ICs is achieved by level-shifters with current sources. The ATA6870 can be connected to three, four, five or six battery-cells. Up to 16 circuits (96 cells) can be cascaded in one string. The number of strings is not limited.
ATA6870主要特性：
• 12-bit Battery-cell Voltage Measurement
• Simultaneous Battery Cells Measurement in Parallel
• Cell Temperature Measurement
• Charge Balancing Capability
– Parallel Balancing of Cells Possible
• Integrated Power Supply for MCU
• Undervoltage Detection
• Less than 10 μA Standby Current
• Low Cell Imbalance Current (< 10 μA)
• Hot Plug-in Capable
• Interrupt Timer for Cycling MCU Wake-ups
• Cost-efficient Solution Due to Cost-optimized 30V CMOS Technology
• Reliable Communication between Stacked ICs Due to Level Shifters with Current Sources and Checksum Monitoring of Data
• Daisy-chainable
Each IC Monitors up to 6 Battery Cells
– 16 ICs (96 Cells) per String
– No Limit on Number of Strings
• Package QFN48 7mm 7mm
ATA6870应用：
• Battery Measurement, Supply and Monitoring IC for Li-ion and NiMH Battery Systems in Electric (EV) and Hybrid Electrical (HEV) Vehicles Benefits
• Highest Safety Level for Li-ion Battery Systems in Combination with ATA6871
• Cost Reduction Due to Integrated Measurement Circuit and High Voltage Power-supply
图1。ATA6870方框图
图2。ATA6870降功耗框图
图3。采用内部电源的MCU电源
图3。采用外部电源的MCU电源
图4。两个堆栈ATA6870的应用电路
图5。ATA6870评估板外形图
The ATA6870 evaluation board for Li-Ion/NiMH Battery Management applications. The evaluation kit consists of two boards:
• Evaluation board with ATA6870 and external MOSFETs for charge balancing
• Controller board with the microcontroller ATmega128 For a comfortable control of the evaluation board, a graphical user interface is available.
图6。ATA6870评估板方框图
图7。ATA6870评估板电路图
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